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BugFix: pole of stateless StateSpace object is empty array

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Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -399,7 +399,7 @@ def freqresp(self, omega):`
`399`	`399`	`defpole(self):`
`400`	`400`	`"""Compute the poles of a state space system."""`
`401`	`401`
`402`		`-returneigvals(self.A)`
	`402`	`+returneigvals(self.A)ifself.stateselsenp.array([])`
`403`	`403`
`404`	`404`	`defzero(self):`
`405`	`405`	`"""Compute the zeros of a state space system."""`

Lines changed: 6 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -378,6 +378,12 @@ def testPole(self):`
`378`	`378`	`self.assertTrue(abs(z)<1)`
`379`	`379`
`380`	`380`
	`381`	`+deftestPoleStatic(self):`
	`382`	`+"""Regression: pole() of static gain is empty array"""`
	`383`	`+np.testing.assert_array_equal(np.array([]),`
	`384`	`+StateSpace([],[],[],[[1]]).pole())`
	`385`	`+`
	`386`	`+`
`381`	`387`	`defsuite():`
`382`	`388`	`returnunittest.TestLoader().loadTestsFromTestCase(TestStateSpace)`
`383`	`389`

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